Chaser and mounting therefor.



Specification of Letters Patent.

Beit known that I, VICTOR R; IKooia'rz, a citizenrof the United States; 'and' a resident of `VV'aynesboro, in the f county off Franklin andi State: of "Pennsylvania, have invented" certain. new and useful Improvements in Chaserszan'dMountings The'refor, of which the followings is a specification.

My. inventionwrelates to an irriprovementxr in 1 Chasers i andf mountingsatherefor and the primary objectthereof is to'provide ay chaser. of ithetype-:which is vcommonlyfused with r rotating die headsfor the purposeI-oifcutting i threads'. upon bolts f and #the like, and

which jean; beImounted-uponfa die 'head finf suohff'a fashion-'that-:it can be yreadily'y replaced and adjusted under-` all conditions that: arevmet @avv/ith in actual-practice:

The: above` and:l other 'objects 4and advantages :of my jinvention avillappear in the following: description takenin` connection with the accompanying drawings; the same charactersr oiy .reference being :employed to indicate the. same'- :parts throughout ythe several views; On lsaid Adrawings Figurel is a` front view; partly fin section, showing my improved chaserimountedA in operative-relationfuponfa support Which is to Fig.. 6fis a bottom plan of the chaser blockf:

Referring part-icularly to [the drawings I indicate by ineans-of-the 'numeral l a'sup-P portorbracket to which is secured myrime" proved i'orm of chaser 2; this Chaser having:

longitudinalparallel cutting teeth 3 on'one face-and preferably being beveled at one end asshoivn atf4. The bracket or support l is locatedbon the diehead, whichv is not illustrated,fin-any .convenient way andv it Willbe understood by those skilled in the art-thatasmany of these supports, each Carrying a chaser 2, vvill `be' associated'ivith fthef'dief" head as Convenience'V-orl-the nature of the service-tobeperformeddictates.` It :is cus A tomary forthe ymostpart-to use fourre-f' thesesup-ports upon: eachV irotating die. head; the supports being of course placed equidis tantly apartand' being located at equaldise'f tances fromthe Center or axis of rotation of Patented Feb, 20,' i191 7.-

the',y die head.4 For example, in Fig. 2, 'the top `edge ofthe support 1 may beL conceivedw as'having the same degree of curvature as the" 'circul'ardie head by which it 'is to be Carried; and it 'vvill beseen thatif each support be 'caused' to revolve in a counter clock-'l Wisedirection'; the center of eurvaturefof' beveled end 4 of eachchaserQ Will describe a Circle about the centerof curvature or axis" oi'lrotation of the ldie' head `Whichlivill bei* equal ito the inside diameterof the threads onathe'stook which the teeth 3 will cut.` I

may oifcourse iX each bracket. or support Ito* the die head orI mayfmoun't the same there-v on in such .a Way'A thatitcan" be adjusted about an axis vvhich is parallel Ato the axis Iof rotation; Vwherebythechase'r 2 Can not only be setacoording tothe size vof thestock or bolt tobe threaded, but canv also be readily"4 -moved into-1 andout of Workingposition.1y

Onftheltop of eachsupport 1 is located an outwardextendingwprojection 5, which is shown:V in the formof an L-shaped rib."- One sideio-f this projection is flush with the inside edgexof the' support; and secured to this side is thechfaser holder 6, which is in the form of anropenl` ended trough, as particularly shown in Fig. :5. This chaser holder receiveswthe*` chaser block 7; Whichl has' transverse teeth or projections 8 and the chaser block Ais securedI to the chaser 2, which has corresponding teeth or fprojectionsQ. "The teeth 9 have their forvvardffaces, that is,their faces Which are locat'ed'toufa'rd' the 4beveled end 4 of `the f chaser, inclined; `While the rear- Lfaces of these teeth areabruptorperpendicular to the'surface .in which" they'are formed. As for the teeth S on the block 7 theyalso-have abrupt andinclined faces, but'l are reversely ar-V range,d;fso-that when the lblock and chaser' arelput'together, thef abrupt `facesV of` the teeth 8 vvillcome in Contact With the abrupt faces of the teeth). These abruptfaces will therefore: `receive the .longitudinal thrust against lthefbevel'ed end 4 When the chaser is inaoperationy and :rearward movement 'of themchaser or displacementfthereof away from` thestock'vvillbeprevented.` A bolt 10 passing :through suitablefslotsfin the projec-` tion 5,holder 6 and Ablock 7 has-its outerfend threaded to "engage any oneoiz' a number'vof screwthreaded bores in thechaser tore-v tain-:the chaser-infadjustable'position,as Will befpresentlymore .fully set forth; 1

Y Chaser block 7 has adjacent one end a short slot 14 and the holder is also provided with a hole 15 in the bottom of the recess 12; with the result that when the boss 11 is fitted into the yrecess 1 2 and the block 7 placed in the trough shaped holder 6 between the sides 16 of the same, the one bolt 13 will be sufficient to secure Vthe block, the holder and the bracket or support 1 permanently together, as will be apparent from inspection of Fig. 1. The bolt 13 has ahead on its outer end provided with a kerf to enable it to be turned by a suitable tool and this head engages a seat surrounding the slot 14:; whereby the block 7 can be held in the holder and at the same time be capable of some degree of sliding movement for the purpose of adj ustment, as will presently appear. Y

The holder 7 is thickened at one end as shown at 17 and this end has a longitudinal screw lthreaded bore to receive an adjusting screw 18. I indicate by means of the numeral 19 the slots above mentioned in the rib 5, block 6 and holder 7; and these slots allowthe bolt 10, Ythe'rib 5, the holder 6 and the block 7l to have relative movement sidewise of the bolt. It will be apparent that byv turning up the screw 18, this screw'can be caused to' engage the rear end of block 7 and forceA the same forward; that is to say to the left in Fig. 1. In this way the chaser block 7 and the chaser 2 can be properly adjusted whenever the necessity for adjustment may arise. 1

The utility and mode of my invention will now be clear.. In order to assemble the chaser and other parts of my improvement j I first secure the holder 6 and'block 7 to the rib 5 by means of the screw 13, I next insert the bolt 10 through the slots'19 and cause the threaded end of the same to engage the foremost one of the series of threaded holes 20 provided in the Chaser 2 to receive it. This bolt has a collar thereon, which is of l greater diameter than the width of the slots 19,fand a polygonal head beyond the collar; so that when the bolt isturned causing the threads to screw in a hole 20, the collar will engage the rib 5 along the sides of the slot therein and draw the chaser into firm contact 'with the chaser blockand cause the teethY 8 and 9 to mesh with each other. Of course the chaser 2 is adjusted longitudinally-by hand before thetightening of the bolt 10 causes the teeth 8 and 9 to come together and if any finer adjustment is necessary, it is effected by means of the screw 18 as above outlined. When the Chaser 2 is adjusted by loosening the screw l0 and disengaging the teeth 8 and 9, the Chaser 2 must be moved a distance that can never be less than the pitch of the teeth 8 and 9; but when adjustment within finer limits is desired the screw 18 is relied upon and by means of it the chaser 2 can be moved inward toward the stock which is being worked for any distance however minute.

Other apertures 21 may be provided where convenient to facilitate joining the above mentioned parts together or assisting in the mounting of the bracket 1 upon the die head, which is omitted from the drawings, as stated. The teeth 8 and 9 may be given any desired pitch and the diameter of the bolt 10 as well as the number of holes 20 and the spacing apart of these holes may be whatever the design of my invention and the nature of the service it is to perform may necessitate. Moreover it is not neces-v sary that the teeth 8 and 9 be made to eX- tend entirely across the faces of the chaser 2 and block 7; it will be sufficient if either the block 7 or the chaser 2 be provided with projections and the other of these two parts be provided with corresponding recesses to receive the projections; since by such a construction practically the same results can be achieved.

I wish to have it understood that the above description and drawings are illustrative only and I do not care to be limited to the' exact structural details set forth, but 100 Abelieve to be new I desire to secure and protect by Letters Patent of the United States:

1. A chaser having cutting teeth on one face and having a plurality of threaded holes longitudinally arranged on its opp() 11o site face.

2. A chaser having cutting teeth on one face, a plurality of transversely disposed teeth on its opposite face, said teeth comprising abrupt and inclined faces, and a longitudinal row of threaded bores on said opposite face.

3. The combination of a chaser having teeth along one side and an element associated therewith, said Chaser and said element having interchangeable and interengaging portions, said element being slidably mounted.

4. A chaser block having a pair of longitudinal slots and having transversely disposed teeth on one of its faces.

5. A trough shaped holder having an aperture and a longitudinally extending slot and carrying an adjusting screw adjacent one end. 13o

6. A support for a Chaser construction having a slotted projection thereon, said projection having a boss extending from one side thereof.

5 7. The combination of a projection With a boss extending therefrom, a holder having a recess receiving said boss, a Chaser block received by said holder, the projection, the holder and the block having coinciding slots,

10 said block having transverse teeth on one face, a Chaser having transverse teeth adapted to mesh With teeth on the block, and having one or more threadedl hores therein, a headed bolt passing through said slots to engage one of said bores in the Chaser, and 15 an adjusting screvvr carried by the holder to engage the block.

Signed at Waynesboro, in the State of Pennsylvania.

VICTOR R. KOONTZ.

Witnesses:

ETHEL WASHABAUGH, WATSON R. DARSIN.

Copies of lthis patent may be obtained for ve `cents each, by addressing the Commissioner of Patents, Washington, D. C. 

